CN110185507B - Deep energy-saving comprehensive utilization device and method for circulating water waste heat of indirect air cooling unit - Google Patents
Deep energy-saving comprehensive utilization device and method for circulating water waste heat of indirect air cooling unit Download PDFInfo
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- CN110185507B CN110185507B CN201910387802.5A CN201910387802A CN110185507B CN 110185507 B CN110185507 B CN 110185507B CN 201910387802 A CN201910387802 A CN 201910387802A CN 110185507 B CN110185507 B CN 110185507B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 266
- 238000001816 cooling Methods 0.000 title claims abstract description 119
- 239000002918 waste heat Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000006096 absorbing agent Substances 0.000 claims abstract description 19
- 239000000428 dust Substances 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims abstract 5
- 238000002955 isolation Methods 0.000 claims description 98
- 238000010521 absorption reaction Methods 0.000 claims description 34
- 230000001105 regulatory effect Effects 0.000 claims description 31
- 238000013461 design Methods 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000011045 prefiltration Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 239000000779 smoke Substances 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 239000003570 air Substances 0.000 description 189
- 238000010977 unit operation Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a deep energy-saving comprehensive utilization device and method for circulating water waste heat of an indirect air cooling unit. The steam turbine unit is connected with a condenser through a steam exhaust pipeline, a condensate pump is connected with the condenser, a shaft seal heater is connected with the condensate pump, a low-pressure heater and a low-temperature coal economizer are connected with the shaft seal heater, a dust removing device is connected with the low-temperature coal economizer, the low-temperature coal economizer is connected with an air preheater, a boiler warm air blower is connected with the boiler warm air blower, an air filter is connected with the fan, an expansion tank is connected with the boiler warm air blower, a second circulating water pump is connected with the expansion tank, an absorber is connected with the second circulating water pump, an evaporator is connected with the absorber, a steam condensate water outlet pipe and a steam inlet pipe are connected with a generator, the generator is connected with the absorber, the condenser is connected with the evaporator, and the condenser is connected with the boiler warm air blower through a closed circulating water outlet pipe.
Description
Technical Field
The invention relates to a deep energy-saving comprehensive utilization device and method for circulating water waste heat of an indirect air cooling unit.
Background
In recent years, with the rapid development of the power industry in China, large-capacity and high-parameter thermal generator sets are built in various places throughout the country. For the vast northwest areas of China, due to the serious shortage of water resources and the environmental protection requirement of the country on newly-built units, indirect air cooling is a common way for cooling the exhaust steam of the turbine units. For the indirect air cooling unit, whether the hybrid cooling type indirect air cooling system or the half-condensing type indirect air cooling system with the surface condenser is adopted, the cooling water is in closed circulation, so that the water consumption required by unit cooling is almost zero, and the consumption of the thermal power generating unit to water resources is reduced to the greatest extent. However, because of adopting the indirect air cooling steam turbine set exhaust cooling mode, the design back pressure is 7-10kPa higher than that of the water cooling unit, the designed exhaust temperature under the THA working condition is above 50 ℃, the exhaust waste heat of the low-pressure cylinder of the steam turbine accounts for more than 45% of the heat supply quantity of the boiler outlet, and the loss of the waste heat generated by the circulating water fed into the indirect cooling tower for cooling is huge.
At present, for an indirect air cooling unit, the mode of utilizing the waste heat of high-temperature circulating cooling water is mainly aimed at the indirect air cooling unit with heat supply requirement, the waste heat of the high-temperature circulating water is recovered to a winter heating system for utilization, and for a large number of non-heating units, the waste heat cannot be fully utilized, and only the waste heat can be discharged to the atmosphere through air through an indirect cooling tower of the unit. The discharge of a large amount of spent heat from this portion is not only a great loss of energy consumption for the unit, but also causes unavoidable thermal pollution for the surrounding environment. Meanwhile, as the winter in northern areas of China is long and the climate is cold, when the winter unit operates, the temperature of the ambient air is lower than minus 10 ℃, but the primary air and the air supply temperature of the boiler are designed to be preheated before entering the air preheater, so that the temperature of the primary air or the air supply is about 25-30 ℃, and the low-temperature corrosion and ash blockage of the air preheater caused by the excessively low temperature of the primary air or the air supply entering the air preheater are reduced. The primary air and air supply of the current unit design are used for preheating the primary air and air supply of the boiler by adopting the steam of the auxiliary steam header (four-section steam extraction) at the side of the steam engine during the winter operation of the unit, so that a large amount of high-quality steam can be consumed during the whole winter operation, the economy of the unit operation is affected, and meanwhile, the currently adopted waste heat utilization technology for recycling the waste heat of the circulating water of the indirect air cooling unit to the heating system is lower in the practical application process due to the limitation of the utilization rate of equipment in the heating period. In chinese patent publication No. CN104653241a, an indirect air-cooling unit waste heat recovery device is disclosed, but the indirect air-cooling unit waste heat recovery device is difficult to overcome the above problems, as the publication date is 2015, 05 and 27.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a device and a method for deeply and comprehensively utilizing the waste heat of circulating water of an indirect air cooling unit, which are reasonable in structural design.
The invention solves the problems by adopting the following technical scheme: the deep energy-saving comprehensive utilization device for the circulating water waste heat of the indirect air cooling unit is structurally characterized in that: the system comprises a turbine unit, a steam exhaust pipeline, a condenser, a low-temperature circulating water pipe, a high-temperature circulating water pipe, an indirect cooling tower, a first circulating water pump, a heat pump water supply pipe, a heat pump water return pipe, an evaporator, an absorber, a generator, a condenser, a closed circulating water outlet pipe, a steam condensate outlet pipe, a steam inlet pipe, a condensate pump, an air filter, a fan, a second circulating water pump, an expansion water tank, a boiler air heater, a shaft seal heater, a low-pressure heater, a dust collector, a low-temperature economizer and an air preheater;
the steam turbine unit is connected with the condenser through a steam exhaust pipeline, the condensate pump is connected with the condenser, the shaft seal heater is connected with the condensate pump, the low-pressure heater and the low-temperature economizer are connected with the shaft seal heater, the dust removing device is connected with the low-temperature economizer, the low-temperature economizer is connected with the air preheater, the boiler warm air heater is connected with the air preheater, the fan is connected with the boiler warm air heater, the air filter is connected with the fan, the expansion tank is connected with the boiler warm air heater, the No. two circulating water pump is connected with the expansion tank, the absorber is connected with the No. two circulating water pump, the evaporator is connected with the absorber, the steam condensate water outlet pipe and the steam inlet pipe are all connected with the generator, the generator is connected with the evaporator, the condenser is connected with the boiler warm air heater through a closed circulating water outlet pipe, the condenser is connected with the room cooling tower through a low-temperature circulating water pipe and a high-temperature circulating water pipe, the evaporator is connected with the low-temperature circulating water pump through a water return pipe, and the evaporator is connected with the high-temperature circulating water pump through a water return pipe.
Further, the indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device further comprises a first isolation valve, a second isolation valve, a first regulating valve, a third isolation valve, a fourth isolation valve, a fifth isolation valve, a second regulating valve, a sixth isolation valve, a seventh isolation valve, a eighth isolation valve and a ninth isolation valve, wherein the first isolation valve and the first regulating valve are sequentially arranged on a heat pump water supply pipe along the flowing direction, the second isolation valve is arranged on a heat pump water return pipe, the third isolation valve is arranged on a pipeline connected with a boiler air heater through an expansion water tank, the fourth isolation valve is arranged on one branch of a low-temperature economizer, the fifth isolation valve and the ninth isolation valve are both arranged on the other branch of the low-temperature economizer, the eighth isolation valve and the second regulating valve are sequentially arranged on a steam inlet pipe along the flowing direction, the sixth isolation valve is arranged on a steam condensate water outlet pipe, and the seventh isolation valve is arranged on a closed circulating water outlet pipe.
Further, the device for deeply and comprehensively utilizing the waste heat of the circulating water of the indirect air cooling unit further comprises a pre-filter and a water pump, wherein the pre-filter is connected with the air filter, the generator is connected with the absorber through the water pump, and the condenser is connected with the absorber.
Further, the number of the seventh isolation valves is two, and the two seventh isolation valves are arranged on the closed circulating water outlet pipe.
Further, one branch of the low-temperature economizer is connected with a condensate pipeline of the low-pressure heater, and the other branch of the low-temperature economizer is connected with a pipeline between the shaft seal heater and the condensate pump.
Further, another technical purpose of the invention is to provide a comprehensive utilization method of the circulating water waste heat deep energy-saving comprehensive utilization device of the indirect air cooling unit.
The technical purpose of the invention is achieved by the following technical scheme.
A comprehensive utilization method of an indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device is characterized by comprising the following steps: the comprehensive utilization method comprises the following steps: the waste heat of circulating water cooled by a unit-to-unit cooling tower is recovered by an absorption heat pump set driven by low-pressure final-stage or penultimate-stage steam extraction of about 0.1MPa, the recovered heat is sent to a boiler air heater through a closed circulating water system arranged in the system, the temperature of the boiler air supply and primary air is heated to about 90 ℃, and meanwhile, the temperature of the discharged smoke of the boiler is increased to be increased by the temperature of the discharged smoke of the boiler, and the discharged smoke is recovered to a unit condensate system through a low-temperature economizer of the unit.
Further, the absorption type heat pump set is adopted to recycle the waste heat of the circulating water of the indirect air cooling unit, and the waste heat is sent to the boiler heater through a closed circulating water system designed by the system, so that the temperature of the boiler air supply and primary air is heated to about 90 ℃.
Further, the waste heat source entering the absorption heat pump group for waste heat recovery is high-temperature circulating water in a high-temperature circulating water pipe in the indirect air cooling unit, can be directly taken from an outlet of a circulating water pump of the indirect air cooling unit or an outlet of a heat pump water supply pipe of a condenser of the indirect air cooling unit, can fully utilize the power of the circulating water pump in the original design of the unit as driving, and does not need to add an additional power driving device.
Further, after heat recovery is carried out on the high-temperature circulating water of the indirect air cooling unit through the absorption heat pump, backwater can be directly returned to a circulating water return pipeline of the indirect air cooling unit through a heat pump backwater pipe.
Further, a first regulating valve is arranged on the heat pump water supply pipe, and the flow of the circulating water can be regulated through the first regulating valve according to the temperature difference of the circulating water under different working conditions so as to control the stability of the absorption heat pump set in the running process.
Furthermore, a first isolation valve and a second isolation valve are respectively arranged on the heat pump water supply pipe and the heat pump water return pipe, so that the isolation and the overhaul of the system are facilitated.
Furthermore, a second regulating valve and an eighth isolating valve are arranged on the steam inlet pipe, so that the driving steam quantity can be conveniently controlled, and the isolation and the overhaul of the system are facilitated.
Furthermore, a sixth isolating valve is arranged on the steam condensate outlet pipe, so that the isolation and the overhaul of the system are facilitated.
Further, the condensed water of the driving steam can return to the condenser of the indirect air cooling unit through the steam condensed water outlet pipe.
Further, the system is provided with a closed circulating water system which is used for delivering heat recovered by the absorption heat pump set to the primary air at the side of the boiler and the boiler heater, and heating the primary air and the air supply temperature of the boiler to about 90 ℃.
Further, an expansion water tank is arranged at the inlet of the second circulating water pump in the closed circulating water system and is used for supplementing water to the system and maintaining the running stability of the closed circulating water system.
Furthermore, a third isolating valve and a seventh isolating valve are arranged on the pipeline of the closed circulating water entering the absorption heat pump set and the closed circulating water outlet pipe, so that the isolation and the overhaul of the system are facilitated.
Further, the system is provided with a variable-frequency closed-type circulating water pump for supplying circulating power required by primary air and an air supply heater at the side of the boiler for conveying heat recovered by the heat pump set, and meanwhile, the system also plays a role in variable-frequency regulation and is used for guaranteeing that the temperature of the primary air and the air supply heated by the heater is stabilized at about 90 ℃.
Further, because the system is provided with a closed circulating water system, primary air and air supply are heated by adopting a mode of air-water heat exchange for the primary air and the boiler air heater, and auxiliary steam in the original design can be reserved to an interface pipeline of the air heater, so that the standby of a heat source of the boiler air heater is ensured, and the safety and stability of unit operation are improved.
Compared with the prior art, the invention has the following advantages:
the invention relates to an absorption type heat pump set which adopts low-pressure final stage or penultimate steam extraction of an indirect air cooling unit as driving steam, recovers high-temperature circulating water spent heat before an indirect air cooling unit enters an indirect cooling tower for cooling, conveys recovered heat to primary air and an air supply heater at the side of a boiler through a circulating water system designed by a system, heats the air supply and primary air inlet temperature of the boiler to about 90 ℃, and simultaneously utilizes a low-temperature economizer system designed by the system to reduce the rise of the exhaust gas temperature of the boiler after the air preheater caused by the rise of the primary air and the air supply temperature of the boiler, and charges and recovers part of the heat to a condensing water system of the unit, thereby improving the boiler efficiency and the circulating heat efficiency of the unit.
The technical scheme of the invention subverts the concept and functions of the traditional boiler air heater, can effectively improve the boiler efficiency and the circulating heat efficiency of the unit, reduces the energy consumption of the unit and improves the running economy of the unit; in addition, by utilizing the high-temperature circulating water waste heat before part enters the inter-cooling tower for cooling, the heat load of the inter-cooling tower of the unit is reduced, and the running economy of the unit is improved; meanwhile, the device can avoid the low-temperature corrosion and ash blocking of the air preheater caused by the excessively low temperature of the primary air and the air supply entering the air preheater by heating the primary air and the air supply of the boiler, and improves the safety and stability of unit operation.
Drawings
Fig. 1 is a schematic structural diagram of a deep energy-saving comprehensive utilization device for circulating water waste heat of a hammon type indirect air cooling unit in an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a deep energy-saving comprehensive utilization device for circulating water waste heat of a miller type indirect air cooling unit according to an embodiment of the invention.
In the figure: the steam turbine unit 1, the steam exhaust pipeline 2, the condenser 3, the low-temperature circulating water pipe 4, the high-temperature circulating water pipe 5, the indirect cooling tower 6, the first circulating water pump 7, the heat pump water supply pipe 8, the heat pump water return pipe 9, the first isolation valve 10, the second isolation valve 11, the first regulating valve 12, the evaporator 13, the absorber 14, the generator 15, the condenser 16, the closed circulating water outlet pipe 17, the steam condensate outlet pipe 18, the steam inlet pipe 19, the condensate pump 20, the third isolation valve 21, the fourth isolation valve 22, the air filter 23, the fan 24, the fifth isolation valve 25, the second regulating valve 26, the sixth isolation valve 27, the seventh isolation valve 28, the eighth isolation valve 29, the ninth isolation valve 30, the second circulating water pump 31, the expansion tank 32, the boiler heater 33, the shaft seal heater 34, the low-pressure heater 35, the dust remover 36, the low-temperature economizer 37, the air preheater 38, the pre-filter 39 and the water pump 40.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1-2, it should be understood that the structures, proportions, sizes, etc. shown in the drawings attached hereto are merely used in conjunction with the disclosure of the present specification and should not be construed as limiting the scope of the present invention, which is defined by the appended claims, and any structural modifications, proportional changes, or adjustments of size, which may fall within the scope of the present disclosure without affecting the efficacy or achievement of the present invention. In the present specification, the terms "upper", "lower", "left", "right", "middle" and "a" are used for descriptive purposes only and are not intended to limit the scope of the invention, but are also intended to be within the scope of the invention without any substantial modification to the technical content.
The indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device in the embodiment comprises a turbine unit 1, a steam exhaust pipeline 2, a condenser 3, a low-temperature circulating water pipe 4, a high-temperature circulating water pipe 5, an indirect cooling tower 6, a first circulating water pump 7, a heat pump water supply pipe 8, a heat pump water return pipe 9, an evaporator 13, an absorber 14, a generator 15, a condenser 16, a closed circulating water outlet pipe 17, a steam condensate outlet pipe 18, a steam inlet pipe 19, a condensate pump 20, an air filter 23, a fan 24, a second circulating water pump 31, an expansion tank 32, a boiler heater 33, a shaft seal heater 34, a low-pressure heater 35, a dust removing device 36, a low-temperature economizer 37, an air preheater 38, a pre-filter 39, a water pump 40, a first isolation valve 10, a second isolation valve 11, a first regulating valve 12, a third isolation valve 21, a fourth isolation valve 22, a fifth isolation valve 25, a second regulating valve 26, a sixth isolation valve 27, a seventh isolation valve 28, an eighth isolation valve 29 and a ninth isolation valve 30.
In this embodiment, the turbine unit 1 is connected with the condenser 3 through the steam exhaust pipeline 2, the condensate pump 20 is connected with the condenser 3, the shaft seal heater 34 is connected with the condensate pump 20, the low-pressure heater 35 and the low-temperature economizer 37 are both connected with the shaft seal heater 34, the dust collector 36 is connected with the low-temperature economizer 37, the low-temperature economizer 37 is connected with the air preheater 38, the boiler warm air heater 33 is connected with the air preheater 38, the fan 24 is connected with the boiler warm air heater 33, the air filter 23 is connected with the fan 24, the expansion tank 32 is connected with the boiler warm air heater 33, the No. two circulating water pump 31 is connected with the expansion tank 32, the absorber 14 is connected with the No. two circulating water pump 31, the evaporator 13 is connected with the absorber 14, the steam condensate water outlet pipe 18 and the steam inlet pipe 19 are both connected with the generator 15, the generator 15 is connected with the absorber 14, the condenser 16 is connected with the evaporator 13, the generator 15 is connected with the condenser 16, the boiler warm air heater 33 is connected with the air preheater 38 through the closed circulating water outlet pipe 17, the condenser 3 is connected with the condenser 6 through the low-temperature circulating water pipe 4 and the high-temperature circulating water pipe 5 and the high-temperature circulating water pipe 9 and the high-temperature circulating water pipe 13 are connected with the high-temperature circulating water pump 14 through the high-temperature circulating water pipe 9 and the high-temperature circulating water pipe 9 is connected with the absorber 14.
The first isolation valve 10 and the first regulating valve 12 in this embodiment are sequentially installed on the heat pump water supply pipe 8 along the flow direction, the second isolation valve 11 is installed on the heat pump water return pipe 9, the third isolation valve 21 is installed on the pipeline of the expansion tank 32 connected with the boiler air heater 33, the fourth isolation valve 22 is installed on one branch of the low-temperature economizer 37, the fifth isolation valve 25 and the ninth isolation valve 30 are both installed on the other branch of the low-temperature economizer 37, the eighth isolation valve 29 and the second regulating valve 26 are sequentially installed on the steam inlet pipe 19 along the flow direction, the sixth isolation valve 27 is installed on the steam condensate water outlet pipe 18, the seventh isolation valve 28 is installed on the closed-type circulating water outlet pipe 17, the seventh isolation valve 28 is two, the seventh isolation valves 28 are both installed on the closed-type circulating water outlet pipe 17, one branch of the low-temperature economizer 37 is connected with the condensate pipeline of the low-pressure heater 35, and the other branch of the low-temperature economizer 37 is connected with the pipeline between the shaft seal heater 34 and the condensate water pump 20.
The comprehensive utilization method of the indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device in the embodiment comprises the following steps: the waste heat of the circulating water cooled by the unit-fed cooling tower 6 is recovered by adopting an absorption heat pump set driven by low-pressure final-stage or penultimate-stage steam extraction of about 0.1MPa, the recovered heat is sent to a boiler air heater 33 through a closed circulating water system arranged in the system, the temperature of the boiler air supply and primary air is heated to about 90 ℃, and the temperature of the boiler exhaust gas caused by the temperature increase is recovered to a unit condensation water system through a low-temperature economizer 37 of the unit.
Preferably, the waste heat of the circulating water of the indirect air cooling unit is recovered by adopting an absorption heat pump set, and the waste heat is sent to a boiler heater 33 through a closed circulating water system designed by the system, so that the temperature of the boiler air supply and the primary air is heated to about 90 ℃.
Preferably, the waste heat source entering the absorption heat pump group for waste heat recovery is high-temperature circulating water in the high-temperature circulating water pipe 5 in the indirect air cooling unit, can be directly taken from the outlet of the circulating water pump of the indirect air cooling unit or the outlet of the heat pump water supply pipe 8 of the condenser of the indirect air cooling unit, and can fully utilize the power of the circulating water pump in the original design of the unit as driving without adding an additional power driving device.
Preferably, after heat recovery is performed on the high-temperature circulating water of the indirect air cooling unit through the absorption heat pump, backwater of the high-temperature circulating water can be directly returned to a circulating water return pipeline of the indirect air cooling unit through the heat pump backwater pipe 9.
Preferably, the first regulating valve 12 is arranged on the heat pump water supply pipe 8, and the flow of the circulating water can be regulated and controlled through the first regulating valve 12 according to the difference of the temperature of the circulating water under different working conditions, so that the stability of the absorption heat pump set in the running process is controlled.
Preferably, a first isolation valve 10 and a second isolation valve 11 are respectively arranged on the heat pump water supply pipe 8 and the heat pump water return pipe 9, so that the isolation and the overhaul of the system are facilitated.
Preferably, a second regulating valve 26 and an eighth isolating valve 29 are arranged on the steam inlet pipe 19, so that the control of the driving steam quantity and the isolation and maintenance of the system are facilitated.
Preferably, a sixth isolating valve 27 is arranged on the steam condensate outlet pipe 18, so that the isolation and maintenance of the system are facilitated.
Preferably, the condensed water of the driving steam can flow back to the condenser 3 of the indirect air cooling unit through the steam condensed water outlet pipe 18.
Preferably, the system is provided with a closed-type circulating water system for supplying heat recovered by the absorption heat pump unit to the primary air on the boiler side and the boiler heater 33, and heating the primary air and the supply air to about 90 ℃.
Preferably, an expansion tank 32 is arranged at the inlet of the second circulating water pump 31 in the closed circulating water system for supplementing water to the system and maintaining the operation stability of the closed circulating water system.
Preferably, a third isolation valve 21 and a seventh isolation valve 28 are arranged on the pipeline of the closed circulating water entering the absorption heat pump set and the closed circulating water outlet pipe 17, so that the isolation and the overhaul of the system are facilitated.
Preferably, the system is provided with a variable-frequency closed-type circulating water pump for supplying circulating power required by primary air on the boiler side and an air supply heater with heat recovered by the heat pump set, and meanwhile, the system also plays a role in variable-frequency regulation and is used for guaranteeing that the primary air and the air supply temperature after being heated by the heater are stabilized at about 90 ℃.
Preferably, because the system is provided with a closed circulating water system, the primary air and the air supply of the boiler are heated by adopting a mode of air-water heat exchange for the primary air and the boiler air heater 33, and meanwhile, auxiliary steam in the original design can be reserved to an interface pipeline of the air heater so as to ensure the standby of a heat source of the boiler air heater 33 and improve the safety and stability of unit operation.
The device and the method for deeply and comprehensively utilizing the waste heat of circulating water of the indirect air cooling unit adopt a low-pressure final stage or a penultimate steam extraction of the indirect air cooling unit as an absorption type heat pump set for driving steam, recover the high-temperature circulating water spent heat before the indirect air cooling unit enters an indirect cooling tower for cooling, and convey the recovered heat to a primary air and an air supply heater at the side of a boiler through a circulating water system arranged in the system, and heat the air supply and the primary air inlet temperature of the boiler to about 90 ℃; and meanwhile, a low-temperature economizer system designed by the system is used for reducing the rise of the exhaust gas temperature of the air preheater caused by the rise of the primary air and the air supply temperature of the boiler, and the part of heat is charged and recycled to the indirect air cooling unit high-temperature circulating water waste heat deep energy-saving comprehensive utilization and recycling technology of the unit condensation water system. The method and the device can improve the boiler efficiency and the unit circulation heat efficiency, reduce the unit energy consumption, improve the economy of unit operation, and simultaneously reduce the heat pollution caused by the replacement of a large amount of waste heat to the surrounding.
For a 600MW level indirect air cooling unit, the back pressure under the designed THA working condition is 12kPa, and the corresponding saturation temperature is 49.5 ℃. In order to fully utilize the waste heat of circulating water of an indirect air cooling unit, reduce energy loss, improve the running economy of the unit, and reduce environmental heat pollution caused by exhaust heat emission of the unit.
The invention relates to a deep energy-saving comprehensive utilization method and a device for circulating water waste heat of an indirect air cooling unit, which adopt low-pressure final stage or penultimate stage steam extraction with the pressure of about 0.1MPa as an absorption heat pump set for driving steam, recycle high-temperature circulating water waste heat before cooling an indirect air cooling unit into an indirect cooling tower, and convey the recovered heat to a primary air and an air supply heater at the side of a boiler through a circulating water system arranged in the system, and heat the air supply and the primary air inlet temperature of the boiler to about 90 ℃. The waste heat source entering the absorption heat pump group for waste heat recovery is high-temperature circulating water of the indirect air cooling unit, can be directly taken from an outlet of a circulating water pump of the indirect air cooling unit, can fully utilize the power of a circulating water pump in the original design of the unit as driving, and does not need to add an additional power driving device. After the heat recovery and cooling of the high-temperature circulating water of the indirect air cooling unit are carried out through the absorption heat pump, the backwater of the high-temperature circulating water of the indirect air cooling unit can be directly returned to a circulating water return pipeline of the indirect air cooling unit. The driving steam of the absorption heat pump can be extracted by adopting a low-pressure final stage or a penultimate stage of the unit with the pressure level of 0.1MPa, and condensed water of the driving steam can be recovered into a thermal well of the indirect air cooling unit through a pipeline. The system is provided with a special closed circulating water system and is used for conveying heat recovered by the absorption heat pump set to the primary air at the side of the boiler and the air supply heater to heat the primary air, and the air supply and the primary air inlet temperature of the boiler are heated to about 90 ℃.
The following cases are realized by the deep energy-saving comprehensive utilization device and method for the circulating water waste heat of the indirect air cooling unit:
1. taking 600MW Haymond indirect air cooling unit of a certain factory as an example, seven sections of extraction steam of the unit are used as driving steam of an absorption heat pump through calculation, the annual average load rate of the unit is 80 percent, the primary air and the air supply temperature entering the air preheater are used as boundary conditions of a design working condition (90 ℃), the calculation is respectively carried out according to the average temperature of four seasons of the factory in spring, summer, autumn and winter, and the annual saving fund amount of the device is 458 ten thousands yuan.
2. The equipment can effectively absorb the waste heat of the circulating water of the indirect air cooling unit, so that the heat load of the unit indirect cooling tower is effectively reduced, and the waste heat amount effectively utilized in the high-temperature circulating water of the indirect air cooling unit under the working condition accounts for about 2.1% of the heat load of the indirect cooling tower, so that the running back pressure of the unit is reduced, and the running economy of the unit is improved.
3. The device of the invention is put into the boiler to raise the primary air and the air supply temperature to about 90 ℃, thereby effectively avoiding the low-temperature corrosion and ash blocking of the air preheater caused by the over low primary air and air supply temperature entering the air preheater and improving the safety and stability of the operation of the unit.
For a hammon indirect air cooling system (see fig. 1), the specific steps are as follows:
according to the deep energy-saving comprehensive utilization device and method for the circulating water waste heat of the indirect air cooling unit, a waste heat source entering the absorption heat pump unit for waste heat recovery is high-temperature circulating water in the high-temperature circulating water pipe 5 of the indirect air cooling unit, the waste heat can be directly taken from the outlet of the heat pump water supply pipe 8 of the circulating water pump of the indirect air cooling unit, the power of the circulating water pump in the original design of the unit can be fully utilized as driving, and an additional power driving device is not required to be added. After heat recovery is carried out on the high-temperature circulating water of the indirect air cooling unit through the absorption heat pump, backwater can be directly returned to a circulating water return pipeline of the indirect air cooling unit through the heat pump backwater pipe 9. A first regulating valve 12 is arranged on the heat pump water supply pipe 8, and the flow of the circulating water can be regulated by the regulating valve according to different temperatures of the circulating water under different working conditions so as to control the stability of the absorption heat pump unit in the running process; and a first isolation valve 10 and a second isolation valve 11 are respectively arranged on the heat pump water supply pipe 8 and the heat pump water return pipe 9, so that the isolation and the overhaul of the system are facilitated.
The device and the method for deeply and comprehensively utilizing the waste heat of circulating water of the indirect air cooling unit are characterized in that low-pressure final stage or penultimate stage steam extraction with the pressure of about 0.1MPa is adopted as an absorption type heat pump set for driving steam, and a steam inlet pipe 19 is provided with a No. eight isolation valve 29 and a No. two regulating valve 26, so that the control of the driving steam quantity and the isolation and maintenance of a system are facilitated. And a sixth isolating valve 27 is arranged on the steam condensate outlet pipe 18, so that the isolation and maintenance of the system are facilitated. The condensed water of the driving steam can return to the condenser 3 of the indirect air cooling unit through the steam condensed water outlet pipe 18.
The device and the method for deeply and comprehensively utilizing the waste heat of the circulating water of the indirect air cooling unit are provided with a special closed circulating water system, the variable-frequency closed circulating water pump is used for conveying circulating water absorbed in the absorption type heat pump set to the primary air at the side of the boiler and the boiler heater 33, and the primary air and the air supply passing through the variable-frequency closed circulating water pump are heated to about 90 ℃ so as to replace the steam for heating the primary air and the air supply of the boiler by an auxiliary steam header (four-section steam extraction) adopted in the original design, thereby improving the running economy of the unit. The expansion tank 32 is used for supplementing water to the closed circulating water system, so that the safety of the system operation is ensured.
The device and the method for deeply and comprehensively utilizing the circulating water waste heat of the indirect air cooling unit are designed to be used for reducing the rise of the exhaust gas temperature of the boiler after the air preheater 38 caused by the rise of the primary air and the air supply temperature of the boiler and charging and recycling part of heat into the condensing water system of the unit. The nine-size isolation valve 30 is arranged on the condensate pipe of the low-temperature economizer 37 and is used for automatically adjusting the temperature of the heated condensate water so as to ensure that the temperature of the heated condensate water is matched with the temperature of the condensate water header pipe and avoid vibration of the condensate pipe caused by temperature deviation after the condensate water is mixed.
According to the device and the method for deeply and comprehensively utilizing the circulating water waste heat of the indirect air cooling unit, a special automatic control module can be arranged in a DCS control system of the unit, and the operation of the whole device is automatically controlled according to the change of the operation working condition of the unit through calculating the frequencies of a first regulating valve 12, a second regulating valve 26, a ninth isolating valve 30 and a variable-frequency circulating water pump which are arranged in the control system, so that the operation stability of the system is ensured.
For the miller type indirect air cooling system (see fig. 2), the specific embodiment thereof is the same as the hammon type indirect air cooling system.
In addition, it should be noted that the specific embodiments described in the present specification may vary from part to part, from name to name, etc., and the above description in the present specification is merely illustrative of the structure of the present invention. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present patent. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The utility model provides an energy-conserving comprehensive utilization device of indirect air cooling unit circulating water waste heat degree of depth which characterized in that: the device comprises a turbine unit (1), a steam exhaust pipeline (2), a condenser (3), a low-temperature circulating water pipe (4), a high-temperature circulating water pipe (5), an indirect cooling tower (6), a first circulating water pump (7), a heat pump water supply pipe (8), a heat pump water return pipe (9), an evaporator (13), an absorber (14), a generator (15), a condenser (16), a closed circulating water outlet pipe (17), a steam condensate outlet pipe (18), a steam inlet pipe (19), a condensate pump (20), an air filter (23), a fan (24), a second circulating water pump (31), an expansion water tank (32), a boiler heater (33), a shaft seal heater (34), a low-pressure heater (35), a dust collector (36), a low-temperature economizer (37) and an air preheater (38);
the steam turbine unit (1) is connected with the condenser (3) through a steam exhaust pipeline (2), the condensate pump (20) is connected with the condenser (3), the shaft seal heater (34) is connected with the condensate pump (20), the low-pressure heater (35) and the low-temperature economizer (37) are both connected with the shaft seal heater (34), the dust removing device (36) is connected with the low-temperature economizer (37), the low-temperature economizer (37) is connected with the air preheater (38), the boiler warm air heater (33) is connected with the air preheater (38), the fan (24) is connected with the boiler warm air heater (33), the air filter (23) is connected with the fan (24), the expansion tank (32) is connected with the boiler warm air heater (33), the second circulating water pump (31) is connected with the expansion tank (32), the absorber (14) is connected with the second circulating water pump (31), the evaporator (13) is connected with the absorber (14), the steam generator (14) is connected with the condenser (16), the steam generator (16) is connected with the condenser (16) and the steam generator (16), the condenser (16) is connected with the boiler warm air blower (33) through a closed circulating water outlet pipe (17), the condenser (3) is connected with the indirect cooling tower (6) through a low-temperature circulating water pipe (4) and a high-temperature circulating water pipe (5), the evaporator (13) is connected with the low-temperature circulating water pipe (4) through a heat pump water return pipe (9), and the evaporator (13) is connected with the high-temperature circulating water pipe (5) through a heat pump water supply pipe (8).
2. The deep energy-saving comprehensive utilization device for circulating water waste heat of an indirect air cooling unit according to claim 1, wherein the device is characterized in that: the device comprises a circulating water waste heat deep energy-saving comprehensive utilization device of an indirect air cooling unit, and further comprises a first isolation valve (10), a second isolation valve (11), a first regulating valve (12), a third isolation valve (21), a fourth isolation valve (22), a fifth isolation valve (25), a second regulating valve (26), a sixth isolation valve (27), a seventh isolation valve (28), a eighth isolation valve (29) and a ninth isolation valve (30), wherein the first isolation valve (10) and the first regulating valve (12) are sequentially arranged on a heat pump water supply pipe (8) along the flowing direction, the second isolation valve (11) is arranged on a heat pump water return pipe (9), the third isolation valve (21) is arranged on a pipeline connected with a boiler air heater (33) through an expansion water tank (32), the fourth isolation valve (22) is arranged on one branch of a low-temperature coal economizer (37), the fifth isolation valve (25) and the ninth isolation valve (30) are both arranged on the other branch of the low-temperature coal economizer (37), the eighth isolation valve (29) and the eighth isolation valve (29) are sequentially arranged on a water outlet pipe (17) of the closed-type steam circulating water return pipe (17).
3. The deep energy-saving comprehensive utilization device for circulating water waste heat of an indirect air cooling unit according to claim 1, wherein the device is characterized in that: the device for deeply and comprehensively utilizing the waste heat of the circulating water of the indirect air cooling unit further comprises a pre-filter (39) and a water pump (40), wherein the pre-filter (39) is connected with the air filter (23), the generator (15) is connected with the absorber (14) through the water pump (40), and the condenser (16) is connected with the absorber (14).
4. The indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device according to claim 2, wherein the device is characterized in that: the number of the seventh isolation valves (28) is two, and the two seventh isolation valves (28) are both arranged on the closed circulating water outlet pipe (17).
5. The indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device according to claim 2, wherein the device is characterized in that: one branch of the low-temperature economizer (37) is connected with a condensate pipeline of the low-pressure heater (35), and the other branch of the low-temperature economizer (37) is connected with a pipeline between the shaft seal heater (34) and the condensate pump (20).
6. A comprehensive utilization method based on the indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device according to any one of claims 1-5, which is characterized in that: the comprehensive utilization method comprises the following steps: the waste heat of the circulating water cooled by the unit sending-room cooling tower (6) is recovered by adopting an absorption heat pump set driven by low-pressure final-stage or penultimate-stage steam extraction of 0.1MPa, the recovered heat is sent to a boiler air heater (33) through a closed circulating water system arranged in the system, the temperature of the boiler air and primary air is heated to 90 ℃, and meanwhile, the temperature of the discharged smoke of the boiler is increased by the aid of the low-temperature economizer (37) of the unit and is recovered to a condensing water system of the unit.
7. The comprehensive utilization method of the indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device is characterized by comprising the following steps of: the waste heat of circulating water of the indirect air cooling unit is recovered by adopting an absorption type heat pump set, and the circulating water is sent to a boiler air heater (33) through a closed circulating water system designed by the system, so that the temperature of the air supply and the primary air of the boiler is heated to 90 ℃; the waste heat source entering the absorption heat pump group for waste heat recovery is high-temperature circulating water in a high-temperature circulating water pipe (5) in the indirect air cooling unit, and is directly taken from an outlet of a circulating water pump of the indirect air cooling unit or an outlet of a heat pump water supply pipe (8) of a condenser of the indirect air cooling unit, so that the power of the circulating water pump in the original design of the unit is fully utilized as driving, and an additional power driving device is not required to be added; after heat recovery is carried out on the high-temperature circulating water of the indirect air cooling unit through the absorption heat pump, backwater can be directly returned to a circulating water return pipeline of the indirect air cooling unit through a heat pump backwater pipe (9).
8. The comprehensive utilization method of the indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device is characterized by comprising the following steps of: a first regulating valve (12) is arranged on the heat pump water supply pipe (8), and the flow of the circulating water is regulated and controlled through the first regulating valve (12) according to the different temperatures of the circulating water under different working conditions, so that the stability of the absorption heat pump set in the running process is controlled; a first isolation valve (10) and a second isolation valve (11) are respectively arranged on the heat pump water supply pipe (8) and the heat pump water return pipe (9), so that the isolation and the overhaul of the system are facilitated; a second regulating valve (26) and an eighth isolating valve (29) are arranged on the steam inlet pipe (19), so that the control of the driving steam quantity and the isolation and maintenance of the system are facilitated; and a sixth isolation valve (27) is arranged on the steam condensate outlet pipe (18), so that the isolation and maintenance of the system are facilitated.
9. The comprehensive utilization method of the indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device is characterized by comprising the following steps of: the condensed water of the driving steam returns to the condenser (3) of the indirect air cooling unit through the steam condensed water outlet pipe (18); the system is provided with a closed circulating water system which is used for sending heat recovered by the absorption heat pump set to a primary air at the side of the boiler and a boiler heater (33) and heating the primary air and the air supply temperature of the boiler to 90 ℃; an expansion water tank (32) is arranged at the inlet of a second circulating water pump (31) in the closed circulating water system and is used for supplementing water to the system and maintaining the running stability of the closed circulating water system; and a third isolation valve (21) and a seventh isolation valve (28) are arranged on a pipeline of the closed circulating water entering the absorption heat pump set and a closed circulating water outlet pipe (17), so that the isolation and the overhaul of the system are facilitated.
10. The comprehensive utilization method of the indirect air cooling unit circulating water waste heat deep energy-saving comprehensive utilization device is characterized by comprising the following steps of: the system is provided with a variable-frequency closed circulating water pump to provide circulating power required by conveying heat recovered by the heat pump set to primary air at the side of the boiler and an air supply heater, and meanwhile, the system also plays a role in variable-frequency regulation, and the primary air and the air supply temperature after being heated by the heater are stabilized at 90 ℃; the system is provided with a closed circulating water system, primary air and air supply are heated by adopting a mode of air-water heat exchange for primary air of the boiler and a heater (33) of the boiler, and auxiliary steam in the original design is reserved to a heater interface pipeline.
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